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Full text of "Text Book Of Mechanical Engineering"

734

Pump Efficiencies.

valve c, none passing D, while the volume in B, or halfa goes to
delivery pipe: thus there is constant delivery, though suction only
occurs on alternate strokes. An additional non-return valve E
permits each pump to be worked separately. (See also pp. 1204
to 1210.)

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Pump Efficiencies. — At Fig. 723 is a diagrammatic
statement of the efficiencies of centrifugal and piston pumps
under different heads, shewing that the former are least efficient